Pregnancy calculators

Plan and follow a pregnancy: estimate your due date, fertile window, conception date, next periods and healthy weight gain.

Due Date and Pregnancy both start from your last menstrual period (LMP) and Naegele's rule — Due Date gives just the date, while Pregnancy also shows your current week, trimester and milestones. Pregnancy Conception and Conception both work backwards from a due date or other known point to estimate when conception likely happened; Pregnancy Conception is written for an already-confirmed pregnancy, Conception for someone trying to work out a likely date before or without a formal due date.

Ovulation and Period are for cycle tracking before or between pregnancies — your fertile window and predicted next periods. Pregnancy Weight Gain is the only one about a number other than dates: a healthy weight-gain range through pregnancy, based on IOM guidelines and your pre-pregnancy BMI.

Pregnancy CalculatorPregnancy week, trimester and key milestone dates Pregnancy Weight Gain CalculatorHealthy weight gain range for your pregnancy week Pregnancy Conception CalculatorEstimate when you conceived from your due date Due Date CalculatorEstimated due date from LMP, conception, IVF or scan Ovulation CalculatorOvulation day and fertile window for six cycles Conception CalculatorBest days to conceive and the resulting due date Period CalculatorPredict your next periods, ovulation and fertile days